You take 13 breaths per minute. Which means in 1 hour or 60 minutes, you will take 13*60 = 780 breaths per hour.
If you take 780 breaths per hour, in one day which is 24 hours, you will take 780*24 = 18720 breaths per day.
Now if the question is asking the number of breaths in one hour and one day, or rather 25 hours, the answer would be 18720 + 780 = 19500 breaths.